Sequence on experiment in colorimetry, determination of reaction of test subject to various colors. PAN from woman being tested to operator. CU of face of woman lit up by differently coloured lights. HAMCS of scientist working on test apparatus, working with slide rule. Near vertical HA PAN of four scientists working at table in laboratory. Closer HAS of one technician. HAMCS PAN of several test tubes filled with chemicals lying side by side on table. Front shot of man in anechoic chamber (silent room), pads on his ears. Several shots, mostly CUs, of apparatus consisting of glass and metal tubing on table, glow lamps. Two MCSs of gauge used in sound transmission experiment.